Device for producing images.



H. S. GAY.& E. W. DUKE. DE'VICE FOR PRODUCLNG imAaEs. APPLICATION FILED'APR.16. 1913.

1% v Patented July 13, 1915.

2 SHEETS-SHEET 1.

in $41 461 :22 i A +2. 3. 53W in E W. DUKE.

DEWQE FOR PRODUCiNG IMAGES. Armmm'xow FILED AFR. 16, 1913.

- Patented July 13, 1915.

2 SHEETSSHEET 2- @TAE 1h 1% FATE??? HAROLD S.

GAY AND ELZA, W. DUKE, 9 LOS ANGELES, CALIFORNIA, ASSIEGHORS 37GSTEREO-ANNUNGMTQR 00., A COREORATIQN 0F GALIFOREIIA.

DEVICE F033 PRGDUCILMG IMAGES.

Specification of Letters Patent.

Patented Julty i3,

Application filed. April 16, 1913. Serial No. 1 651529.

To all whom it may concern:

Be it known that We, HAROLD S. GAY and Enm W. DUKE, citizens of theUnited States, residing at Los Angeles, in the,

county of Los Angeles and State of California, have invented new anduseful lIrnprovemcnts in Devices for 'Producing images, of which thefollowing is a specification. v

This invention relates to devices for producing images on screens, andin view of it such devices when equipped as hereinafter generallydescribed may be used to perform functions that have not hitherto beensatisfactorily and conveniently performed. For instance, such a devicewhen embodying this invention is very well adapted to perform thefollowing valuable service in connection with an ordinary moving pictureoutfit: A series of slides may be supplied to' the device, each slidecontaining some suitable information such as the title or other notesconcerning a certain scene to be exhibited.

by the moving picture outfit, "While each.

one particular moving picture and should.

preferably be displayed during the Whole period in \vliichthat moving"picture scene is being run. In this event persons Witnessing the movingpicture scene may conveniently glance over at the image of the slide andmay refresh their memory as to the title of the main picture, or as toany other notes carried by said slide and concerning same.

- 0r elw persons joining the audience after 7 notes, which will renderthe scene more interesting and pleasurable. Other advantages to bederived by the continued pres ence of the notes of the main picture mayreadily suggest themselves cool-ding to the variable dispositions ofdiiierent persons in the audience; but the commercial advantains meansfor successively interposing the several slides into position so thatthe iroage of each may be cast on the screen when the correspondingmoving picture is about to he displayed. The operation of interposin thenext succeeding slide is performed automaticaily after said operation isonce started; and for the purpdse of starting said operation and settingthe proper elements of the device into motion this invention contemplates ,manuailyoperated or controlled means such as a push' buttonand. other accessories in an electric circuit iorstarting; the aforesaidoperation at Will. In view of such an arrangement the device may bepositioned at any suitable point either in the op crating booth of themoving picture outfit, or else atsome point remote from same and nearerto the screen WhGTBOD. the image is to be cast. In the latter event, acoinparatively weaker light will be adequate to the purpose, but ineither event the aforesaid push botton in the controlling circuit willbe located in the aforesaid operating booth. When the operator,therefore, is about to iii? commence the display of the next subscstatedthis Will result automatically and Without further attention-on theoperators part in the display or the next subsequent slide whichproperly bears the notes relative to said moving picture.

Though other advantageous and novel features appear in consideration ofthe detailed description hereinafter set forth, or by inspection of theaccompanying drawings, it inay be well at this point to referparticularly to another basici'eature of the invention, wherebyincreased emphasis is a tracted to'the image produced by the device."When the operator touches the push button for the purpose of startingthe next subsemm autnmaiy @pemss 30 simultanex rally cm; 03; its OWE 3iso thatduring the Ch: U lies zmi 1m ages Fae sizreen is ioiafiy at thatpaini wivera :Zhca Q15 the siida is be a, ix hen the next s ssl ida Vagain 6215i? the light myl walks the scream as'sg: suddeniyiiashabsmplem image 511120 "View 509- {GT6 thee auc'iiewe. thusimpreaqing sai l .ia siatively br agazceen which previmlsly 512.1315,consirk enable attention is aiimcfiefl tr; ifis cmmmms .zmi iahaadveriawmex cam'zaimd therein are cex'respond'ngiy 6m 12:52am abvb nusbanefit, bb'ah w 12311.4 gilbfifl mac? to :16? wjz'izisei's, I I

'ihough 133365 foreigning T85 il'iust ate one of the mare pmmimn lax-msof swvzce which his invan'tiun is calculateti 0 meet it wiil beunziersfmed "imfi devices equipped wiiwh the bmad and navel featureshexinafter set mm may Tue used 3501' a varie gy 0i purpases, amnng whichthe follawing @9- serves pai'icuia .Imilfiflilf A "puhiic 192mm? usingsit-ei seopi'llwfi Views mrijlusizmting his talk may, Be-fem mini:ncinghifi fiecizure suitably arrange his s liii as' *s he (Tuevice, andmay 61m??? he @Iecfiricai coniro iiingcircuit, Q1151 imt lion filerein,up to the platfcarm 35mm which he infieinds 0 speak. After suitably iimnifig k-he lens and? commencing h liegi um he need mere oper ate filepush mam, aaeh "zi 'me h 'wishes 230 display the next smbsequ ishismeans 531w nee- 1 nf assistant is altogether obviated ieazfimmr as50221- plete scntroi @Yfiilijhfi kmgifil 03? iizmw: {flaring "which a,cezf szvln picture is ciisphyed, and ever 63b0, partiaulm? iime' atwhich aha icfiure is changed far the (ma nez'fi Samarium In wder 50adapt levice fmah e 117i; ous'fm'ms of service Y b it be Cliifli upon topeyfozm cemjai'n mechanic?! changes "he spirit 01-": anventmm, mad n05;

'P T I A. vbhe efwe be specmcafly p mm mm he accompany :g'a flash-ma 5.m

.- ;;he rievice Carmin wnnectiens invammn.

, image 1111 a port-ism of the may be 'fmmd necessary 01* desim bke inthe (23:2 53m Y "i H 091202 as snowy 13 5 she 2 mjfiusimed a mcandescemglee; Ju lamp, imam I .3.151 L n "116mg n 01: e-zmrn m sunshmmm; and Uthmugband M V whnie SE? we a $5113 comm 161%, as a he suppm tasting Iand e periphery m. @ment 1s 'i'oungi c o oh neaause 0i iiaiiy drum. *5 vanienfi'. a

in ximuniw n same M16. faciiity 's' which 5* 21m .1m sanensfs s' him(lm'mb cm ain siie is posiii-m'ea? 5m.

3, and so as to be interposed-in the path of the 'light'rays that passthrough the focusing means, said slide may be said to occupy its activeposition, because it will be its image that is cast upon the screen whenthe lightproducing means is in operation. The slide, of course, maycontain any suitable information ashas been hcreinbefore set forth; butif the device is used for lecturing purposes the slide contains thestereopticon views, etc, in which event it is preferable that the slidesand slide-holders be relatively smaller than those shown in the figures,so that a greater number of slide-holdei's can be provided on theslide-carrying means, and a larger collection of slides charged into thedevice.

In order that the operator, after having exhibited a certain slide, maybe able to opcrate said slide-carrier so as to carry the next slide intointerposed position in the path of the light rays, certain mechanism,now to bedescribed, is provided; and it will be noticed that theoperation of said mechanism is automatic after such operation is oncestarted. One form of mechanism, which satisfactorilyaccomplishes thisfunction, is shown in thefigures to include a wheel 18 having a circularperiphery 19 with notches 20, Figs. 1 and 2, cut therein.

This wheel 18 is shown to be integrally con-.'

structed with the shaft 11, Fig. 4, though any other mode foroperatively connecting said wheel and shaft will be satisfactory, itbeing only necessary that the connection between said wheel and saidslide-carrying means 6 be positive, so that the rotation of the lattershall be controlled by the rotation of the former.

A finger generally indicated by number 21, and best illustrated in Fig.6, is preferably secured on an arm 22, Fig. 2, the latter beingpivotally mounted on apin '23. which extends from the rigid supportingbracket 24. The tip 25 of said finger is provided.

with an anti-friction roller 26, and is thereby well-adapted to rideupon the periphery of said wheel and to normally drop, or othcr wisemove, into the notches 20 thereof, in which position said finger arrestsor blocks the rotation of said wheel and thereby arrests and blocks therotation of the slidecarrying means 6. The notches 20 are so timed withrespect to the finger-roller 26 that the slidecarriei"s rotation isarrested when each slide-holder 12 is successively brought into activeposition exactly before the condenser 4.

For the purpose of driving the wheel 18 and shaft 11 the figuresillustrate gearing, which includes a main gear 27 operatively connectedwith wheel 18,- and said gear 27 is driven by a pinion 28, Fig. 4, whichin turn is operat-ively connected with another gear 29, said pinion andgear, 28 and 29, re-

spectively, being rotatively supported on tne.

For reasons, hereinafter described, it is-preferable that said gear 33be capable of hi" ing itself out of mesh with gear 29; and one mode ofaccomplishing this purpose is to mount the shaft 32, which carries gear33 so that said shaft shall be movable. This mounting is accomplished inthe construction shown by supporting motor 31 on a swinging base 34,which in turn is pivotaily carried by pins 35 on the rigid standard 36.The extremity 37 of shaft 32, Figs. 2 and 4, runs in a bearing block 38on the arm 39, the latter being operatively connected with finger 21. asat 40, Fig. 4. By means, operable at the will of the operator and whichmeans will hereinafter be particularly described, the finger 21. iswithdrawn from the notches 20 of wheel 18, and through the motion ofsaid finger said. means simultaneously operates to raise arm 39 andshaft-32 and to thereby throw worm gear into mesh with gear 29.

The electric motor 31 is driven by electric power from any suitablesource such as the battery 41, Fig. 2; and the two branches of thecircuit for said motor are diagram maticallyshown inFig. 2, the first ofsaid branches including wire 42, switch buttons 43, switch bar 44 andwire 45 leading to binding post 46, from which wire 47 leads saidcircuit includes wire 48 leading to the binding post 49 from which wire50 completes the circuit back to the battery In addition to the wiringjust described, 'a sec ond circuit for the light-producing means 2should be provided; and one branch of this circuit includes wire 51leading from some comm rcial lighting circuit, not shown in the figures,to the binding post 52, and said branch also includes Wire 53, switchbuttons 54-, switch bar 55 and wire 56 leading to the light-producingmeans; while the second branch of said circuit includes wire 57 eX-'.105 to battery 41; while the second branch of motor connol, la'ofihsimnllo-ncously closcou Q'n this scoouoi; w withlmwn from av col; lrJQGthe arm 39 is conscm OllSlj movczl upw ii, close the motox' cir 1 willtshcrcloy s'mr or 31.

- this limo, 2on6. as o rosuls c1 soil moo-ion of arm 39, oho Worm gearwill be, meshing m with gear 29 as has vboon, loc cicbci oscclescrilood, and the mist/ion o scifl motor and. worm gear will belamnsm :5. through gear 29, pinion 28 and gear 9-? to the Wheel 18 oncl.1570 the slialocorr iingj 6, success sivcly, Anti-friction collar 26 ofllxc fingcr 21 being. witl-holmwn from notch 26 (luring this time, mayroll upon alzc circulm' pez'iph- 19 of tho Wheel 18 said. circular paripncl'y will servo to suppor; soicl finger along with in raisedposiiion, and will, thcreforo, continue to llol Worm goo 33 in mesh withgear 29, and the switch bar in Contact with buttons 4.3 until the nextsuccecclingnotoh 20 reaches a position lacnootll cnlbfriclionrollorfifi, During the octiyoperiocl, which has just, been described,and which commonccd as fihc instant when finger 21 "was withdrawn fromnotch 20, it will be soon that the sl-i.l.ccor;*ying means go wcs beingopamlzed so as. so bring the maxi: solaspqucnt slide inao' ac'iiyoposifslon before ciao ooml-enser l; anal it will also be seen lfllm:alluring lhis pcriotl. the swifi l1 bar 55 Was raised ofi? swiich ,lmtzons 54, so that the circuit for light-producing means 9" was openWhcrcbysoicl liglcll pcoduoing moans was inactive; anal whereby itslight rays Wore automolically cut'c oil from the focusin means and from.the screen during sold -perlocl.-' On chc other howl. when the l 2%:Will 4-3 and :ocxt succeeding notch 20 reaches a position immcdlctelybeneath. the cnEi-l'riction roller 26, film latter is released from thesupporting action of the pcriphcrol shoulder 19', and solo anti-frictionroller will therefore drop automatically into the adjoining notch,Thereby as-hc rotalion of the Whccl 18 and the slidcfcm'rying means 6will be arrests/(l. At this inslant lhc next succocdiog sli le will lmvcPoached its active position, soil being exactly orreslecl chore by thecforcsaicl oc- 131011 of rollcr 26, the latter element of finger 21 issoon to accomplish substontiallylvhe function of a brake for that systemof parts, 'alncluding che slide-carrying means 6, the

wheel 18 and the gearing ending with gear 29. As tho finger 21 movesinto notch 20 the arm 39 wzll be lowered COlIESPODClIHglY, and this W111result 1n a three-fold actlon so as follows; first, the swinging ofshaft 32 and Worm gear 33 into the position shown 0y the full lines in2, in which position social Worm gear is out of mesh from gear 29;

soconcl, the z-cmo' of swilch bar 4- from so balloons 43, which causesagainst the finger if wosm goal W this tune moshing Wltll gear 29, cm;

1 being simultaneously open across boll om the notch, and makes ioquitocccmi o a small force oven would; be sufilcleot ing Worm gear 33 fromolisu c 'i tially the sums instant whom 6521c cm Zion roller '26 passcinto-fi braking aclsioo of finger 1s gzcc cllilatcol, it being necessary22o and overcome the momonmzo of fills of Wheel 18, cn-lhc slidooamylogco These aris arc rclaaivoly light and if; rotary specfl compm'ocivclyslow so momentum lo be ovoz'comc lay the considerably less than; wouldcncoun if the relatively hcovy aml'mpidly rev log armature of motor 31wow to cast momentum againsl gear 29, cool ulizi mclrcly against finger21. The momcnom of l motor arniturc would be so 6 parts being unmcshccland the mcor ci 43, the motor armature is cllowccl to .11 freely mm todissipate iizs momo agoinsl; the resistance of his mm he etc. In thisrcgafd attention especially clircc'tsd to the of? 21, which, in the formof c ppamm in the figures, is accomplishcillfiyloom said finger on thepivotal 22., roller 26, therefore, passes into 52 note? the aforesaidmomentum will be Casi: ago the finger in the cllrcction of arrow 62, 2,and the thrust producccl by sai l momsm .tum will be adequately resistedby tho reaction of arm'ZQ, This prevents the fi gcr being abnormallybound and hold withdraw finger 21 from said notch.

We will now describe one suimblc of mahoally-opcraled means whereby ilkfinger is withdrawn from lilac notch :20, so that tho operation of shemechanism inoefore set forth may loo saartml avl' lillfi mil, of theopcmtox. This form of moons includes an clectro-magnet 63 amov'cbloplum. gar 6 operated by said clcctro-magoc electric circuit for saidchasm-magnet, coo o swltch; preferably 5. 121 the form of o poo" but ton65, in said electric circuit. 33v branch of the electric circuit instrclomcnl 1 comprises the Wire cs, bindmg 520% M3,

. of connection beta masses wire l7 leading to the battery ll; while thehuttoii 65 may be handled by the lecturer While standing on the speakersplatform.

The plunger 6i may, of course, be made to operate huge? 21 by anysuitable arrangemost, but a connection broadly resembling the followingpossesses certain advantages hereinafter set forth. This coimectioii isbest understood by reference to Fig. ti, WIGZQ the plunger S lls s'eeutobe'formcd an elongated neck ill/having a collar Jud an annular strikingface T3. 'Fiusei s equipped with a suitaole strap iet, which carries aslot or other proper aces-- tore 7 through which uecl: ll passes. Whenthe electric current is allowed to low in he electro-magnet 63, themovable plum geiwill be drawn up into saidelectromagnet in'accordancewith the-Well-known elementary laws of electro-maguetisro. There havingbeen an appreciable cleairance 6 between the striking face '53 aud-stiap"(4,63 3 electro-magnet Will at the start lift the plunger agaiustitsown weight only, sud will thereby cause the motion oi said plunger to beaccelerated. @n this account,

the plunger velocity will he appreciable after the plunger has movedupward suiiioieiit to erase clearance T5, and in View of this the face73 will strike or impact against the upper part of strap 74, and will orshock, some suiliciently to lift finger 21 out of the notch 20, eventhough said finger may he slightly bound in said notch. As we of thisslight shock or jar the Y arm will ordinarily acquire umvai d motion,and the clectro-mag- (is need merely continue said upward mo" .i startsoul parts from rest against the standinc friction of same, In View ofan arc'a raugeineut such as tins,- the elective-magnet used not havesuch great capacity and the withdrawal of the linger from the notch willbe 21* re certain; but, it Will'be understood, course, that extensivemodificatlons or I hou es may be made is the particular form Withoutdeepening from its spilt, it

necessary "that said plunger being merely he so related to said insteadof being called upon to' .1 the plunger a d fin-' that the former maystrike or tap the latter before commenciug its true lifting action.

Another advantage in the operation of the foregoing construction mavnowbe especially pointed out. Though lilo following situation should neverarise, it may still, through unforeseen reasons, happen that while theaforedescribed mechanism is operating to move the slidc-carryiug meansso that a new slide may be brought into active position, andconsequently, While the finger 21 is not engaging a notch 20, the saidfinger or parts supporting same may become hung or bound slightly, sothat the finger would fail to pass into the next notch which would comeinto registering position. Should this happen the mechanism mightcontinue to operate the slide-carrying means so as to pass one or moreof the slides by the. active position Without stopping them there, inwhich event, of course,'their pictures would be skipped. To preventthis, the worm gear 33 is formed and mounted in such manner that it willconstantly tend to kick itself out of mesh with the gear 29. Forthispurpose said worm gear ispreferably formed with "i -shaped threads 77,Fig. 5, which during operation have an eflicicnt Wedging'action againstthe corresponding Vshaped teeth 78 of gear 29; and on account of thisWedging action the Worm gear will tend to constantly push itselfdownward and out of mesh with the gear 29. This downward thrust isimparted to and resisted by the arm 39, and the latter element, beingoperatively connected with the finger 21, will impart said downwardthrust to said finger. By this means any ordinary sticking or bindingaction. which may tend to hold the linger in its raised position will beovercome; it being understood, however, that this surplus force,impressed upon the finger by arm 39, is merely additional to thegravitational efi ort of the finger itself, of arm 22 and of the plunger.64, which gravitational cfi'cct is ordinarily sufiicientto drive thefinger into the notch.

From the foregoing detailed description, it is believed that theconstruction of the device will be clear, and it will be understood thatthe lecturer, moving picture operator or any other person using thedevice,

judgment or choice of the user, but in oermeans fair the of E51 I meanssiadawarrymg means if s .Q h

index-Email, "cow-bu! imam pile f ,1 1 glide, smiewaumi 7 eta, me 210 mas ss nsiciemd as limited 70 siidfe wigs of glass but that smfi. i9 hasthe mum is (sari-is m1 fiegwgfuy piecas -13)? glassor an sepamise,mashed cuminumzfi 1, In a (Levies far ima gp zs' a screen,light-3911251116 means, e

interpmsimg slinlssin the path 91' 1i 1% ra -Is flint thmuggll sai iifmwsim gamm mechanism afizaptaci togwamta' mi @Iiifls carying; ma ma,said a Wbeei ha ing'a, iwfiehfid pefiph rgg; for rmatiwly driving sfiiciwhaei, a adapiwa'i m ridrv 1.1m peripharymf said wheel and 3m .mnve inicsaid n-catsh s ahhemaff, sairi 23 ps2 aciapteri m arresi; the mm tiom ofsaw. whe el Whzfi said finger islacafied' 3121 said notches 0i midiWheeL an aim:-

fism-magnefi; drawing}; said finger oua Of said mmhm, a switch, and anElectric six? fiche swi'mh be saifi @Eecwm g 23 proiuaing sfiwaarryingmachanilsm .306 m I aim szaifi aahdycm'ir ying ma 21s: or Qynng: same,Sandi mscha'msm mciud a Wheel having; lavished 3%? 5:118?? formtaiiivgly? whee :zdapired a0 rial"; upon the periphery of E; ,9 Wheelto msm i320 saidizmtches zzhereof 'tian of sai Whwl WEEJEZE how's-3&-iri said 'eui'connecsing the swii; N magnet 3. 35121 a devicsforproiucingz; en

scream, slifie-carrying means mechaaim aqfiperating with saidslide-sawing fen opemiiny; same, sai mechaniesm imiudiring: a Wheelhaving a, mafia-hen? 'peripigary means for mathely driving said Wheel, a

gevadapted ride upon $3318 periphery 0;? the wheel t9 m 'vie into said.natcha thereqf, said 136511;: carried an a piw;

wally-mounted g in, and afiaptecl is arre 1 :tatioil when Sam is11325232211 i111 having, a, wmmymaamis drive irpmoiuaw ii mamas,faailsing mwm 02 said lighfiprodlicimg mwnsg Slid 9--C&Tfi*il=3f5j meansfar sucaessiveiy inflame sing siiies in the path 62? said Eight raysishai; pass 353 through said focusing; means, mechanism @0- opemtimgwith sail slidewam' ingmeans; for avera ing; sama, said. mechanism amissconttmlling; sax-5.5 iiight-m aducing means, and said mechanism mewsapemble at the will an op s' 'wbar far causing saii mecharism 23a wammS1iZ8-6fiTEYiH means: and fey mama-sly causing; mechamism W the light sfCum.

lightmmfiiusing 6 a {ievizse using baa-gag a, Sana-2m, shcwwarwmgmeans,cmperiatmg with said sikiwmn'yimg mama for: operating game saidmechanism ring gag,ring-g3x a; Make f0]: arresting fiJhe mfww "1:5571011 0%? gearing, mam far mfiati mh firiving" saidgem'ingg, the lastsaid means cw pemtimg Wiilh said gearing flu'cugh in mm ably mmm'bedgear, saici mawblymmm bad' gear: avcapted kik ifizselsf mm $2 In meshwith midi ,sa ea'iing', @1161 means mul'mmausly 1" asing the brake 12fsaid swim-Lg means and i 91" yummy mommy gear into aims-sh with gearmvamrymg masms slidawsan mamma, a Warm ahmfi;

Warm shaft, and @lectrieaffiy 'apsrateci mmzn: reiaiviy arm- Q Warm gearWhsa! woxm aitemativefiy 511w out a"? a; 'zage manic with @211 azwtheraA 8. In a'fiavice 5301i? pmdiming in'mges SCFQIQZK, siida-aarryingmaams,mechanism w epemzing with @aimi slie-mrwing mews 15m? expel-eating mid37. .1621

wheel, means for Withdrawing said finger fromthe notches of said wheel,gearing for driving said wheel, and driving means for driving saidgearing, said driving means 00- operating with said gearing through aworm gear mounted on a movable shaft.

9. In a device for-producing images on a screen, slide-carrying means,mechanism 00-.

operating with said slide-carrying means for operating same, saidmechanism including a wheel having a notched periphery, a finger adaptedto movelinto the notches of said wheel for arresting the rotation ofsaid heel, gearing for driving said wheel, drivdriving means cooperatingwith said gearing through a worm gear on a movably mounted shaft, andmeans for simultane ously withdrawing said finger from the notches ofsaid Wheel and for moving said shaft so that said worm gear meshes withsaid gearing.

10. In a device for producing images on a sereenaslide-carrying means,mechanism cooperating with said slide-carrying means for operating same,said mechanism including a wheel having a notched periphery, a fingeradapted to ride on the periphery of said wheeland to move into thenotches thereof, said finger being adapted to arrest the rotation ofsaid wheel when said finger is located in said notches thereof, meansfor driving said wheel, the last said means including an electric motor,an electric circuit for said motor and switch in said circuit; means forwithdrawing said fingers from the notches of said wheel and for causingsaid finger to ride on the periphery of saidv wheel, means operativclyconnecting said finger with said switch,'sothat said electric circuit isclosed for operating said motor when said finger rides upon theperiphery of said wheel.

11. In a device-for producing images on a ,screen, slide-carrying means,mechanism c0- operating with said slide-carrying means for operatingsame, said mechanism including a wheel having a notched periphery, afinger adapted to ride on the periphery of said wheel and to move intothe notches thereof, said finger being adapted to arrest the rotation ofsaid wheel when said finger is located in said notches thereof; gearingfor driving said Wheel, a movably mounted electric motor fordriving saidgearing, said motor cooperating with said gearing through a gear on themotor shaft, said gear on the motor shaft being adapted to kick itselfout of mesh with the aforesaid gearing; an electric circuit for saidmotor, a switch in said electric circuit; means operable at the will ofan opmg means for driving said gearing, said .mg said gear on the motorshaft in mesh with the aforesaid gearing.

12. In a device for producing images on a screen, the combination oflight-producing means, focusing means for the rays of saidlight-producing means, slide-carrying means for successivelyinter-posing slides in the path of said light rays that pass throughsaid focusing means, mechanism cooperating with said slide-carryingmeans for operating same, said mechanism including a wheel having anotched periphery, means for rotatively driving said wheel, a fingeradapted to move into the notches of said wheel, said finger beingadapted to arrest the rotation of said wheel when said finger is'locatedin said notches thereof; an electric circuit for said light-producingmeans, a switch in said electric circuit, and means operable at the willof an operator for withdrawing said finger from the notches of saidwheel and for simultaneously opening the switch in said electric circuitso that the light in said light-producmg means is extinguished.

13. In a device for producing images on a screen, slide-carrying means,mechanism, co-

driving said wheel, and driving means for driving said gearing, saiddriving means cooperating with said gearing through a worm gear havingsubstantially V-shaped threads, said worm gear being mounted on a.movable shaft.

14. In combination, a'drum provided with "peripherally arrangedslide-holders, light producing means inside of the drum, a switch tocontrol said light producing means, means to turn the drum and meansoperatable by said drum turning means to switch the light on and oilalternatively.

v In testimonywhereof, we have hereunto set our hands at Los Angeles,California, this 27th day of March, 1913.

HAROLD S. 'GAY. ELZA W. DUKE. In presence of JAMES R. TOWNSEND, Ronan'rA. S'rnrs.

